Hillary Clinton is expected to announce her White House run on Sunday,
the New York Daily News reported.
The former secretary of state, U.S. senator from New York, and first lady of the United States is expected to make her candidacy official on social media and by video.
It has been known for close to a month that Clinton was aiming to make the announcement in April, and
last week's reports that she had rented office space in Brooklyn for her campaign headquarters appeared to confirm that timeline.
Clinton is expected to kick off her official campaign with a series of small events in early-voting states such as New Hampshire and Iowa.
Her expected 2016 presidential bid will mark her second attempt to become the first female elected president.
She had been the early frontrunner for the Democratic Party nomination in 2008, but that was before the insurgent political campaign by freshman Illinois Sen. Barack Obama hit its stride and blew past Clinton and the rest of the Democratic primary field, which included then-Delaware Sen. Joe Biden and the Democrats' 2004 vice-presidential nominee John Edwards.
Seven years after she was defeated in the primaries by Obama, she is again the overwhelming favorite to win the Democratic nomination.
The latest Real Clear Politics average shows her with 59.8 percent of the primary vote, 47.6 percentage points ahead of Massachusetts Sen. Elizabeth Warren of Massachusetts, with 12.2 percent.
Vice President Biden came in a distant third, winning 11.5 percent.
For much of the past year, Clinton has led prospective Republican candidates in most national and state head-to-head polls.
But a new Quinnipiac University poll conducted March 29 to April 7 indicates she may be starting to slip.
The poll found her narrowly trailing Kentucky Sen. Rand Paul in Colorado and Iowa while leading him narrowly in Virginia. It also found that every Republican candidate tied her in Colorado and nearly all did so in Iowa. Moreover, her favorability rating has dropped significantly in Colorado and Iowa since a poll in February.